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TENSION DEVISE FOR SEWING MACHINES.

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ALBERT D. PENTZ, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGERMANUFACTURING COMPANY OF NEW JERSEY.

TENSION DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 319,744, dated June9,1885

Application iiled February 1S, 1885.

To @ZZ whom it may concern:

Be it known that I, ALBERT D. PENTZ, a citizen of the United States,residing at Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Tension Devices forSewing-Machines, of which the following is a specification, referencebeing had therein to the accompanying drawings.

The object of my invention is to provide a simple and effective tensiondevice which is more particularly adapted to be applied to the cap orface plate of a sewing-machine, and to be regulated by a pointedadjustingscrew placed on the top of said plate.

In carrying my invention into effect I employ a lever-spring similar tothat shown by Patent No. 214,513, to L. B. Miller, but provided at itslower end with an offset portion which extends outward through thefaceplate, so that it may bear on the outer face 0f a tension-blockpivoted to said face-plate, the adjacent faces of the said'. block andthe offset portion of said lever-spring forming the friction-surfacesbetween which the thread passes.

In the accompanying drawings, Figure 1 is a face view of the cap or faceplate of a sewing-machine with my invention applied thereto, and Fig. 2is a section of the same and of a portion of the contiguous part of thebracketarm.

A indicates the cap or face plate of a sewing-machine in which theneedle and presser bars have vertical bearings, said'face-plate having aslot, a, through which the take-up lever B projects, as is usual withmany sewing-machines.

C is a lever-spring loosely attached by a screw, c, to the inside of theface-plate, said lever-spring having a bent upper portion, against whichimpinges the pointed end of a regulating-screw, D.

At the lower end of the lever-spring C is a bent or offset portion, c',projecting outward through the face-plate and provided with a slottedthread-hole, c2, and in the bend just above the offset portion c isformed a thread- (No model.)

guiding notch, c3. One side of the lower end of the portion c is turnedoutward, as at c4, forming a lip to facilitate threading. The inner sideof the face-plate is preferably provided with a small projection, c',forming the fulcrum of the lever-spring C.

E is a pivoted tension-block secured in the slot or recess in theface-plate through which.

the thread afforded by the adjacent faces of said block and the offsetportion of said lever parallel.

My tension device is threaded by drawing the thread (indicated by dottedline b) beneath the outwardly-projecting lip c4 into the thread-hole c2and notch c3, whence it passes upward to the take-up lever and thendownward to the needle. 'Ihe tension is varied by means of the pointedregulating-screw D, as in the device shown by the patent to Miller,hereinbefore referred to.

I do not wish to be understood as limiting my invention to theparticular location on the machine in which it is herein shown, as it isobvious that it may be placed in any convenient position on the machine,as circumstances may require.

I claim as my invention- 1. In a sewing-machine tension device, thecombination,with alever-spring having a bent end, as shown, and aregulating-screw movable lengthwise of the said lever-spring and'bearing against the said bent end, of a pivoted tension-block, againstwhich the opposite end of said lever-spring bears, substantially as setforth.

2. The combination, with the cap or face plate of a sewing-machine, 0f alever-spring sceured inside thereof and having an offsetoutwardly-projecting portion, a pivoted tension-block, also attached tosaid face-plate,

and a regulating-screw at the top of said faceplate bearing against theupper end of said lever-spring, substantially as set forth.

3. The combination, with the cap or face .plate A, of the leverspring C,having oiset lportion c', slotted thread-hole c2, guidingnotch c3, andoutwardly-projecting lip c, the A pivoted tension-block E, and theregulatingscrew D, substantially as set forth.

In testimony whereof I aix my signature 1o in presence of two Witnesses.

ALBERT D. PENTZ.

Witnesses:

A. D. HARTWELL, M. F. GANNoN.

